mirror of
https://github.com/ptitSeb/Serious-Engine
synced 2024-11-23 10:50:26 +01:00
373 lines
11 KiB
NASM
373 lines
11 KiB
NASM
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; /* Copyright (c) 2002-2012 Croteam Ltd. All rights reserved. */
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;
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; ------- YOU DO NOT NEED THIS FILE UNDER WIN32 AT THE MOMENT. -------
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;
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; Chances are, you will need NASM (http://www.octium.net/nasm/) to assemble
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; this file.
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;
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; If we were smart, we'd move all the inline asm to similar files, which
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; cleans up the C, and makes the assembly (ahem) more portable. NASM can
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; generate Visual C compatible object files as well as Linux ELF and Intel
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; Mac Mach-O binaries.
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;
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; --ryan.
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; asm shortcuts
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%define O offset
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%define Q qword
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%define D dword
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%define W word
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%define B byte
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%define TRUE 1
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%define FALSE 0
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; ************************
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; ** Start Data Block **
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; ************************
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SECTION .data
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global slMixerBufferSize
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global bEndOfSound
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global bNotLoop
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global fLeftOfs
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global fLeftStep
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global fOfsDelta
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global fPhase
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global fRightOfs
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global fRightStep
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global fSoundSampleRate
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global fStep
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global fixLeftOfs
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global fixRightOfs
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global mmSurroundFactor
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global mmVolumeGain
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global pswSrcBuffer
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global pvMixerBuffer
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global slLastLeftSample
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global slLastRightSample
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global slLeftFilter
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global slLeftVolume
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global slRightFilter
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global slRightVolume
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global slSoundBufferSize
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slMixerBufferSize dd 0
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pvMixerBuffer dd 0
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pswSrcBuffer dd 0
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slLeftVolume dd 0
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slRightVolume dd 0
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slLeftFilter dd 0
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slRightFilter dd 0
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slLastLeftSample dd 0
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slLastRightSample dd 0
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slSoundBufferSize dd 0
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fSoundSampleRate dd 0
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fPhase dd 0
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fOfsDelta dd 0
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fStep dd 0
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fLeftStep dd 0
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fRightStep dd 0
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fLeftOfs dd 0
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fRightOfs dd 0
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fixLeftOfs dd 0, 0
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fixRightOfs dd 0, 0
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mmSurroundFactor dd 0, 0
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mmLeftStep dd 0, 0
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mmRightStep dd 0, 0
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mmVolumeGain dd 0, 0
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mmInvFactor dd 0x00007FFF, 0x00007FFF
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bNotLoop dd 0
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bEndOfSound dd 0
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f65536 dd 65536.0
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f4G dd 4294967296.0
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; ************************
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; ** End Data Block **
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; ************************
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; ************************
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; ** Start Code Block **
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; ************************
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SEGMENT .text
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global MixMono_asm
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MixMono_asm:
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push ebx ; Save GCC register.
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; convert from floats to fixints 32:16
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fld D [fLeftOfs]
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fmul D [f65536]
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fld D [fRightOfs]
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fmul D [f65536]
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fld D [fLeftStep]
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fmul D [f65536]
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fld D [fRightStep]
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fmul D [f4G]
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fistp Q [mmRightStep] ; fixint 32:32
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fistp Q [mmLeftStep] ; fixint 32:16
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fistp Q [fixRightOfs] ; fixint 32:16
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fistp Q [fixLeftOfs] ; fixint 32:16
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; get last played sample (for filtering purposes)
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movzx eax,W [slLastRightSample]
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movzx edx,W [slLastLeftSample]
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shl eax,16
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or eax,edx
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movd mm6,eax ; MM6 = 0 | 0 || lastRightSample | lastLeftSample
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; get volume
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movd mm5,D [slRightVolume]
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movd mm0,D [slLeftVolume]
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psllq mm5,32
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por mm5,mm0 ; MM5 = rightVolume || leftVolume
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; get filter
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mov eax,D [slRightFilter]
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mov edx,D [slLeftFilter]
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shl eax,16
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or eax,edx
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movd mm7,eax ; MM7 = 0 | 0 || rightFilter | leftFilter
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; get offset of each channel inside sound and loop thru destination buffer
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mov W [mmRightStep],0
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movzx eax,W [fixLeftOfs]
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movzx edx,W [fixRightOfs]
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shl edx,16
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or eax,edx ; EAX = right ofs frac | left ofs frac
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mov ebx,D [fixLeftOfs+2] ; EBX = left ofs int
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mov edx,D [fixRightOfs+2] ; EDX = right ofs int
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mov esi,D [pswSrcBuffer] ; ESI = source sound buffer start ptr
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mov edi,D [pvMixerBuffer] ; EDI = mixer buffer ptr
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mov ecx,D [slMixerBufferSize] ; ECX = samples counter
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sampleLoop_MixMono:
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; check if source offsets came to the end of source sound buffer
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cmp ebx,D [slSoundBufferSize]
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jl lNotEnd_MixMono
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sub ebx,D [slSoundBufferSize]
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push D [bNotLoop]
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pop D [bEndOfSound]
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lNotEnd_MixMono:
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; same for right channel
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cmp edx,D [slSoundBufferSize]
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jl rNotEnd_MixMono
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sub edx,D [slSoundBufferSize]
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push D [bNotLoop]
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pop D [bEndOfSound]
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rNotEnd_MixMono:
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; check end of sample
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cmp ecx,0
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jle near loopEnd_MixMono
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cmp D [bEndOfSound],TRUE
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je near loopEnd_MixMono
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; get sound samples
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movd mm1,D [esi+ ebx*2] ; MM1 = 0 | 0 || nextLeftSample | leftSample
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movd mm2,D [esi+ edx*2] ; MM2 = 0 | 0 || nextRightSample | RightSample
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psllq mm2,32
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por mm1,mm2 ; MM1 = nextRightSample | rightSample || nextLeftSample | leftSample
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; calc linear interpolation factor (strength)
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movd mm3,eax ; MM3 = 0 | 0 || right frac | left frac
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punpcklwd mm3,mm3
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psrlw mm3,1 ; MM3 = rightFrac | rightFrac || leftFrac | leftFrac
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pxor mm3,Q [mmInvFactor] ; MM3 = rightFrac | 1-rightFrac || leftFrac | 1-leftFrac
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; apply linear interpolation
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pmaddwd mm1,mm3
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psrad mm1,15
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packssdw mm1,mm1 ; MM1 = ? | ? || linearRightSample | linearLeftSample
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; apply filter
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psubsw mm1,mm6
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pmulhw mm1,mm7
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psllw mm1,1
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paddsw mm1,mm6
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movq mm6,mm1
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; apply volume adjustment
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movq mm0,mm5
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psrad mm0,16
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packssdw mm0,mm0
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pmulhw mm1,mm0
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psllw mm1,1
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pxor mm1,Q [mmSurroundFactor]
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paddd mm5,Q [mmVolumeGain] ; modify volume
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; unpack to 32bit and mix it into destination buffer
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punpcklwd mm1,mm1
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psrad mm1,16 ; MM1 = finalRightSample || finalLeftSample
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paddd mm1,Q [edi]
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movq Q [edi],mm1
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; advance to next samples in source sound
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add eax,D [mmRightStep+0]
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adc edx,D [mmRightStep+4]
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add ax,W [mmLeftStep +0]
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adc ebx,D [mmLeftStep +2]
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add edi,8
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dec ecx
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jmp sampleLoop_MixMono
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loopEnd_MixMono:
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; store modified asm local vars
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mov D [fixLeftOfs +0],eax
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shr eax,16
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mov D [fixRightOfs+0],eax
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mov D [fixLeftOfs +2],ebx
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mov D [fixRightOfs+2],edx
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movd eax,mm6
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mov edx,eax
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and eax,0x0000FFFF
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shr edx,16
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mov D [slLastLeftSample],eax
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mov D [slLastRightSample],edx
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pop ebx ; Restore GCC register.
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emms
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ret
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global MixStereo_asm
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MixStereo_asm:
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push ebx ; Save GCC register.
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; convert from floats to fixints 32:16
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fld D [fLeftOfs]
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fmul D [f65536]
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fld D [fRightOfs]
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fmul D [f65536]
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fld D [fLeftStep]
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fmul D [f65536]
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fld D [fRightStep]
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fmul D [f4G]
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fistp Q [mmRightStep] ; fixint 32:32
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fistp Q [mmLeftStep] ; fixint 32:16
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fistp Q [fixRightOfs] ; fixint 32:16
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fistp Q [fixLeftOfs] ; fixint 32:16
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; get last played sample (for filtering purposes)
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movzx eax,W [slLastRightSample]
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movzx edx,W [slLastLeftSample]
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shl eax,16
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or eax,edx
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movd mm6,eax ; MM6 = 0 | 0 || lastRightSample | lastLeftSample
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; get volume
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movd mm5,D [slRightVolume]
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movd mm0,D [slLeftVolume]
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psllq mm5,32
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por mm5,mm0 ; MM5 = rightVolume || leftVolume
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; get filter
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mov eax,D [slRightFilter]
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mov edx,D [slLeftFilter]
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shl eax,16
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or eax,edx
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movd mm7,eax ; MM7 = 0 | 0 || rightFilter | leftFilter
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; get offset of each channel inside sound and loop thru destination buffer
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mov W [mmRightStep],0
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movzx eax,W [fixLeftOfs]
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movzx edx,W [fixRightOfs]
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shl edx,16
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or eax,edx ; EAX = right ofs frac | left ofs frac
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mov ebx,D [fixLeftOfs+2] ; EBX = left ofs int
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mov edx,D [fixRightOfs+2] ; EDX = right ofs int
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mov esi,D [pswSrcBuffer] ; ESI = source sound buffer start ptr
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mov edi,D [pvMixerBuffer] ; EDI = mixer buffer ptr
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mov ecx,D [slMixerBufferSize] ; ECX = samples counter
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sampleLoop_MixStereo:
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; check if source offsets came to the end of source sound buffer
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cmp ebx,D [slSoundBufferSize]
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jl lNotEnd_MixStereo
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sub ebx,D [slSoundBufferSize]
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push D [bNotLoop]
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pop D [bEndOfSound]
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lNotEnd_MixStereo:
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; same for right channel
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cmp edx,D [slSoundBufferSize]
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jl rNotEnd_MixStereo
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sub edx,D [slSoundBufferSize]
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push D [bNotLoop]
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pop D [bEndOfSound]
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rNotEnd_MixStereo:
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; check end of sample
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cmp ecx,0
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jle near loopEnd_MixStereo
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cmp D [bEndOfSound],TRUE
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je near loopEnd_MixStereo
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; get sound samples
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movq mm1,Q [esi+ ebx*4]
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movq mm2,Q [esi+ edx*4]
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pslld mm1,16
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psrad mm1,16 ; MM1 = 0 | nextLeftSample || 0 | leftSample
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psrad mm2,16 ; MM2 = 0 | nextRightSample || 0 | rightSample
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packssdw mm1,mm2 ; MM1 = nextRightSample | rightSample || nextLeftSample | leftSample
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; calc linear interpolation factor (strength)
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movd mm3,eax ; MM3 = 0 | 0 || right frac | left frac
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punpcklwd mm3,mm3
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psrlw mm3,1 ; MM3 = rightFrac | rightFrac || leftFrac | leftFrac
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pxor mm3,Q [mmInvFactor] ; MM3 = rightFrac | 1-rightFrac || leftFrac | 1-leftFrac
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; apply linear interpolation
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pmaddwd mm1,mm3
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psrad mm1,15
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packssdw mm1,mm1 ; MM1 = ? | ? || linearRightSample | linearLeftSample
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; apply filter
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psubsw mm1,mm6
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pmulhw mm1,mm7
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psllw mm1,1
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paddsw mm1,mm6
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movq mm6,mm1
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; apply volume adjustment
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movq mm0,mm5
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psrad mm0,16
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packssdw mm0,mm0
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pmulhw mm1,mm0
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psllw mm1,1
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pxor mm1,Q [mmSurroundFactor]
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paddd mm5,Q [mmVolumeGain] ; modify volume
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; unpack to 32bit and mix it into destination buffer
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punpcklwd mm1,mm1
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psrad mm1,16 ; MM1 = finalRightSample || finalLeftSample
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paddd mm1,Q [edi]
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movq Q [edi],mm1
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; advance to next samples in source sound
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add eax,D [mmRightStep+0]
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adc edx,D [mmRightStep+4]
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add ax,W [mmLeftStep +0]
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adc ebx,D [mmLeftStep +2]
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add edi,8
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dec ecx
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jmp sampleLoop_MixStereo
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loopEnd_MixStereo:
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; store modified asm local vars
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mov D [fixLeftOfs +0],eax
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shr eax,16
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mov D [fixRightOfs+0],eax
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mov D [fixLeftOfs +2],ebx
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mov D [fixRightOfs+2],edx
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movd eax,mm6
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mov edx,eax
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and eax,0x0000FFFF
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shr edx,16
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mov D [slLastLeftSample],eax
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mov D [slLastRightSample],edx
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emms
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pop ebx ; Restore GCC register.
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ret
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; ************************
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; ** End Code Block **
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; ************************
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